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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] straightforward initial-understanding
During intense physical exercise, muscle cells may temporarily switch from aerobic to anaerobic respiration. What substance accumulates in the muscles as a result, and what sensation does this cause?
Generated by claude-sonnet-4-6 · 2026-06-26 00:59 · grounding rag
Model Answer

Lactic acid accumulates in muscle cells during anaerobic respiration. Its build-up causes muscle cramps.

Source: Life Processes, Section 5.3 Respiration

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Explanation

The textbook explicitly states: "the pyruvate is converted into lactic acid… This build-up of lactic acid in our muscles during sudden activity causes cramps." For 1 mark, simply name the substance (lactic acid) and the sensation (cramps). No further detail is needed.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.